CVE-2026-68175 (GCVE-0-2026-68175)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:30
VLAI
Title
tracing: Fix resource leak on mmiotrace trace_pipe close
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix resource leak on mmiotrace trace_pipe close The mmiotrace tracer was added May 12th 2008. At that time, resources created in pipe_open() could not be freed because there was not pipe_close function pointer of the tracer. The pipe_close function pointer was added in December 7th, 2009, but the mmiotrace tracer was not updated. mmio_pipe_open() allocates a header_iter and takes a pci_dev reference when trace_pipe is opened. mmio_close() frees them, but it was only wired to the tracer's .close callback. tracing_release_pipe() invokes .pipe_close, not .close, when the trace_pipe file is released. As a result, closing trace_pipe with the mmiotrace tracer active leaked the header_iter allocation and left a stale pci_dev reference. Set .pipe_close to mmio_close, matching how function_graph wires both callbacks to the same handler. Note, if the trace_pipe is read to completion, it will clean up the resources, but if one were to run: # head -n 1 /sys/kernel/tracing/trace_pipe VERSION 20070824 Over and over again, it would trigger a massive leak.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c521efd1700a8c0f7ce26f011f5eaecca17fabfa , < 7871128ea41217fa6a58bbbcb44cb0d2e9e60966 (git)
Affected: c521efd1700a8c0f7ce26f011f5eaecca17fabfa , < 1d0b59e2b203c02149d8f63607329debe36b3ec5 (git)
Affected: c521efd1700a8c0f7ce26f011f5eaecca17fabfa , < 581ac13e12e77d6c64f8719083bdf95209308919 (git)
Affected: c521efd1700a8c0f7ce26f011f5eaecca17fabfa , < f9e6dfe341fb31c95b9655eb6b1db8b3ae090817 (git)
Affected: c521efd1700a8c0f7ce26f011f5eaecca17fabfa , < 594e1cf3f736779a535873fd5988162d827bfe4f (git)
Affected: c521efd1700a8c0f7ce26f011f5eaecca17fabfa , < cf5a82bef623b969a609f2b7e392d06dbae34aa6 (git)
Affected: c521efd1700a8c0f7ce26f011f5eaecca17fabfa , < cb459fec4f7b13caf646101ff076e94ef38434d8 (git)
Affected: c521efd1700a8c0f7ce26f011f5eaecca17fabfa , < c1d87e724ae55e781b7cc7ccafb34d9e668582b2 (git)
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Linux Linux Affected: 2.6.33
Unaffected: 0 , < 2.6.33 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix resource leak on mmiotrace trace_pipe close\n\nThe mmiotrace tracer was added May 12th 2008. At that time, resources\ncreated in pipe_open() could not be freed because there was not\npipe_close function pointer of the tracer. The pipe_close function pointer\nwas added in December 7th, 2009, but the mmiotrace tracer was not updated.\n\nmmio_pipe_open() allocates a header_iter and takes a pci_dev reference\nwhen trace_pipe is opened. mmio_close() frees them, but it was only\nwired to the tracer\u0027s .close callback.\n\ntracing_release_pipe() invokes .pipe_close, not .close, when the\ntrace_pipe file is released. As a result, closing trace_pipe with the\nmmiotrace tracer active leaked the header_iter allocation and left a\nstale pci_dev reference.\n\nSet .pipe_close to mmio_close, matching how function_graph wires both\ncallbacks to the same handler.\n\nNote, if the trace_pipe is read to completion, it will clean up the\nresources, but if one were to run:\n\n  # head -n 1 /sys/kernel/tracing/trace_pipe\n VERSION 20070824\n\nOver and over again, it would trigger a massive leak."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:30:39.826Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        }
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      "title": "tracing: Fix resource leak on mmiotrace trace_pipe close",
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    "datePublished": "2026-08-10T11:59:45.965Z",
    "dateReserved": "2026-07-30T09:28:09.372Z",
    "dateUpdated": "2026-08-19T16:30:39.826Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix resource leak on mmiotrace trace_pipe close\n\nThe mmiotrace tracer was added May 12th 2008. At that time, resources\ncreated in pipe_open() could not be freed because there was not\npipe_close function pointer of the tracer. The pipe_close function pointer\nwas added in December 7th, 2009, but the mmiotrace tracer was not updated.\n\nmmio_pipe_open() allocates a header_iter and takes a pci_dev reference\nwhen trace_pipe is opened. mmio_close() frees them, but it was only\nwired to the tracer\u0027s .close callback.\n\ntracing_release_pipe() invokes .pipe_close, not .close, when the\ntrace_pipe file is released. As a result, closing trace_pipe with the\nmmiotrace tracer active leaked the header_iter allocation and left a\nstale pci_dev reference.\n\nSet .pipe_close to mmio_close, matching how function_graph wires both\ncallbacks to the same handler.\n\nNote, if the trace_pipe is read to completion, it will clean up the\nresources, but if one were to run:\n\n  # head -n 1 /sys/kernel/tracing/trace_pipe\n VERSION 20070824\n\nOver and over again, it would trigger a massive leak."
          }
        ],
        "id": "CVE-2026-68175",
        "lastModified": "2026-08-19T17:20:33.950",
        "metrics": {},
        "published": "2026-08-10T13:20:04.343",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-31T11:44:30+00:00",
      "cve": "CVE-2026-68175",
      "id": "CVE-2026-68175",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "261",
      "product_status:known_not_affected": "16",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing: Fix resource leak on mmiotrace trace_pipe close",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68175.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:40:08Z",
      "cve": "CVE-2026-68175",
      "id": "CVE-2026-68175",
      "initial_release_date": "2026-08-13T16:23:38Z",
      "product_status:known_affected": "374",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68175",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68175.json",
      "version": "4"
    }
  }
}



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